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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d87a767c8c3e6506e7801e8908de6a9ce7fa3a175a94701b2904fa183bf07f' 
  AND token = 'iMVsVcRqQCTP2jDE4RQcJZk6+m2icc4TirvgwNBU/R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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