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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '157225c048cc494c690bcecb2e6003111a483247277fe0a13a9737bf70415bb6' 
  AND token = 'MCJdQ7zfZ8kI+6Iwc68jK765RI1MeSXluHjIjYEKX2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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