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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5e1daa8cc09c6d2e55a1ac518fe0b6bcc085fcb069b23633df5f1e557d8944' 
  AND token = '8TNCaUAlKWiRnEsyFqyHZmiv2+1U5TvX02t/jMdR2So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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