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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd002a8d06e07891057d9fc3f8507e0efb3b73f770cff2ca1a59753c38400ba75' 
  AND token = '0zz21ZfPwfa4KGcoYiJxyIr1BDz4tCtpf9lZh0N9RAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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