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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfeea0a1466fe141baa183f6a01aa975377cb5e00490eca6da5ad3e3d7d262c8' 
  AND token = 'RgnOl4gl59UZ4jbShx/k5vj25sXw7bvC8WUw+vCRHd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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