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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e3d065d91ac281f4c3d49cbf231871f29f3a682fd70d337dc831dbe2ca14ec6' 
  AND token = 'g/Q75bidW3Q1tVSw8PE2LbCVAGliy7BHXk2STA7CQuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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