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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ea110f2f78b0aa54040adabdd9aea5af15044ea3cb503912f2bc2730c94671a' 
  AND token = '/7fQ+6fVAelt931fHXBXW/zc8L8prxqbB6k13P1p6mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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