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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d38e71c1a85a342c1a7afb0a6826eff520ac804d2b61daa7ea15af3a91b27b' 
  AND token = 'mlzriONEfW2Toi2+F0uKNnR53S2d0PlxtOEgQlSNewE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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