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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd8df42a7e0eaf720213a1bbf236b4e7a43f0abc3f5b4604d80f414337e85d3' 
  AND token = 'sSjlAT5vL2huWxw5O6d8N8wQccaB6FsfVM7BV+bVxwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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