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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d167e75c3afc2ba4b5bcd61fb534bacef9952dfafe1c43b6b6b0de3d1203d6' 
  AND token = 'E24B+Vm/hB0aAYQNCVDe2TbZqTtNujtsiJA3YQbsJL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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