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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d30d2145fb77f78dfa34a59daeba3b6630c6e2e23cad5562e1f722c2542d43' 
  AND token = 'EAYCujbPxwWY02Vlt1gq6O6oCJSKxht8qga4iMMaJbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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