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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e3ae3d8b418d2553d900e8af2d573adc005287758eca946b8a81dd193445b99' 
  AND token = 'qU+2g7DoRyyUmkPPez2HhJ1b6mET7gaedIHllvU4b58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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