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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e8e622e0614d224821fbe0d86beb0930a4de102ec035c577e1293c9234b380' 
  AND token = 'hDy/oD1ur8QCWZqIl/er3p0jIMrFKZbvBIYChvJn2cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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