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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c816c0ad1a1ed6dc9fa9b0e1b567f9b307d01cbf90be06e88f4bf410e377e84' 
  AND token = 'c/7/N4whhjDdCimLx3/AC8HSJs4IQ74RvozkcCP6Bgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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