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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1dad7f25410312f77499ec24ed518931362d3042fe55f605a8ea9938d90c426' 
  AND token = '6fm0tnHRgh1MoHMaW/7ndJPfWLShxwn3/LD/E9EGB5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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