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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '950f38bf31439dab2302277bb41efd7aaf26d8f0a5bdb6aa4a10e215449309b2' 
  AND token = '75+mra3WnoTZeP+fRsWmTBA3ju5rKYOPYrHnsHMKntc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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