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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2da0967dafd6c1b1025b959a05a3b05c8afb16cb43619034ecaed9069ca2a0' 
  AND token = '3X5VQiMV0a1OM2oFZZg8QM///hdfJQy2acOSfOZpUT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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