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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6db398b6b8b2680c99e14f92fa6866fa7cb591bdcee736ec22894ebbb87fc7' 
  AND token = 'djYNOLlV9RDFCrWJD6y+Tfy6+/ECuMZkrrnIKXr0ssQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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