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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef4bffe8fb0336384be082158aff93f8914a953d8f4489e5daac354dd9d984db' 
  AND token = 'E0KslRfGMGWz8yIZ0xrCsqc4abCJ1DqVJHtiQW9V2K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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