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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ea5793886116d3e580ac53837d63e7aff4991d73b1b16d71b01b29d5bbad73' 
  AND token = '7MJ77a2M59AbDZXL08ydig7S4jecK0q5Zi+d9iqYgDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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