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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f0e705ac0d3b0da91c5113c3763eafe9f77ce56c5f0b800bb065327d99cbebc' 
  AND token = 'VYo/COMld4BxLR/DSYXI+vPxtC8nNdK4/3/m7eBIQ60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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