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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd602eb4b04e73328acdf621b01e4c5ccbfe2c6df992e04ef0b33b0e88e89fb9' 
  AND token = 'gBWv27EDnctCqY8/JVwK3bdIqkuyY+chesJUVxi4+x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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