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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828ed473c9015698c121f965f85ad0cb9895292ce18dacf75d5adc2abf98cc2a' 
  AND token = 'j+g4ofvSyg1s2DWWZ3G3HmCGu32cICQlvUB8mGB8GhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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