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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b96239e82c27fa6ee6a96678c52f86497cb11489018bcf55837373ed2470312' 
  AND token = '+d0bORpooGplm67jI2uuMOF866iR+cqBETE1DFB+DgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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