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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db93eb2986660f9238af263a62cdb0f5f431afe791f8b123ed9283b78d0ab61' 
  AND token = 'u1xzWmiHOVMHx8ntp2/6AZrwkAXsUSX5X8u5sCmusfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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