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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75137833400b809faf44cc9a954d18ea4cfa1c6ab237c12889b6626badf2d2f9' 
  AND token = 'phNp6KKm0elqSENLy0y3sug/dIad/VbERsTJ1O1eFcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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