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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e112d41dadbf7a5d1b5eb6d0472ebf456afcc41ea977125e7511b1bd9e96803b' 
  AND token = 'MMOQEiij+OOh32WkMrKV98mnx+x0+lEE/bx+GqxDTjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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