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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f98716807dfe0f05f0befc4c9a09147dcc45fa473d927bb5bde2c1f284c6d27' 
  AND token = 'rpSH6N/MX2wNtEx0umYC5HUqC9ZWOIKNsy1rUNSrpLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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