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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633ab03586ff57d68ae36364af8edca8486a83f6502bf9b6bfc6ccf9b226293f' 
  AND token = 'bRDVepqgoANrM6B9ORcM5Ysaj0sfm8Otq7ajcnVSuL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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