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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26533bd59829f494b55ce75210d5681ae89c5026b6cc11f797fa3ac38e1862e2' 
  AND token = 'Ygk7brHF9w1KO55HV6gHeZZiqNgN507GNxCJpNKL9H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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