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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31df0dd44d9b460fbb7743c2375d2cb5695b4bda0eb93ffd10bf451ca3d588b2' 
  AND token = 'PV45wHapVgmdha8q20jonndFbsdsK6bC1/+8nPKx5EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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