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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48171a0d6feeda87881f26caeb68e0ca687fd85bddb625d3f1fcffb529de6893' 
  AND token = '0p/n68YE982PLXRvfNHi8+w7oZqAH5t4SHOyz1DMeE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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