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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad808a0431de1ec666b3bd699c3a09286ee3b1a659036ca1ed0828f45f14397' 
  AND token = '2yb7V63kCZu22YvsSe/ECjUkH3mQimQSg1eciPwogdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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