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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d7b4b93c46873bf6ef0e1e8be47f97256120af370aca262de3951809c4083a' 
  AND token = 'atXgEJ7MI+Nt9futvg28i7aww/DluMkcGAB8/cwlhOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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