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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6b2259a7c01e96f73f9cb1423eb8a9a2a22d680368e4c3270edf5dc6c09c7d' 
  AND token = 'h9c1VCh2sU1lFt9XCbsek4irVyv5JdF+Vq83lj21yU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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