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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1ed75f1d937fc714e1ca2ea3bb71e02040f873fab38ffd8a3c712bdd2804a2' 
  AND token = '0ucTsfWDHxvnmdEyRiwUbeRFfFdQ8T/Y0fmqX27owc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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