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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1bf88436f0b39e1c52fbf0116d41aad8016d82b284fc1d26ee81ea8753d9c5b' 
  AND token = '7BSOgsKYCHoPDt0ZsKteHgRWC1hOZhLHev6Z/QURd+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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