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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b293f7c106a1b9915570d4a5d7b8832a8ef5018eb2130361d66d85ef27e14f5' 
  AND token = 'iVvcfzrdSJEvMjBSzCWwWciMjPfiqdm1zKiW6Kn39tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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