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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73fea5d022872c73530898c063ef635d5db6cb22c55af63150c6ca90164aa2c' 
  AND token = '5aPN0xMCPXgwhMEDzYB9F+83V8hySH+F3ZMpzOHzad8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}