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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763e6f997e6a56a6be77fa105634df2d8f36557c17d3cb3829eeb93bd6f540ff' 
  AND token = 'tIpPEi0FPqgW+bbdyGVU6fCaehsA1z+QG+DUQalLbs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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