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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e6359bb02ac44a3a8b642b5a9b26b7a9700193ab27bdf0937047c17adcacc8' 
  AND token = 'E2B8ZJl0I3kcBkvMvO/f0k8oW08Uo3t9cbUJaNsOYv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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