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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '343b0d41ddd6985da4762656ffe47b6009621234e60376a02fd9e93d47a0bc64' 
  AND token = 'nWNgBavfVt3Vy9uViy2bpVBZ8lPixbXILsTpIDVxYLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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