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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13451c1a21fba55114d1a1381caecb046a0030cc58eb7fb7eb04acbd102bcfcc' 
  AND token = 'MB4HPsUyDFXOAQiqZ95zX1Ul2H6rIx14V1YBnjfRfCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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