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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2cc5fac1ea4771044a66f0076a49dfe139a8037106604e332f0364e59086a0' 
  AND token = 'SB8MeQ7OZAq3TW/b7VN/wmjQMdoKzGb1a/dDe3dtp6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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