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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e29e41debd3e5ecac4dac1c5e3b012f2f52ff3a0c142132506b67bbe65a356f0' 
  AND token = 'AbB4JEclbUfu/sLvBh6444K2KXMEF/RWtOZH2AqOsOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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