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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e662c8ee5e55100886e38a08ea555d28907e85a162ab6dbf0d825e7181b10752' 
  AND token = '9YpwgbXGienix+cnEVTtH2/R5a59jwttJd6GfJhmq8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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