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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267f2dc6fa8c40b85551e0c957e8196e3b3d48497e5ca2461490c47223f24f6e' 
  AND token = 'JIKsspLfAboH4NP4POh4Sw6RtAX3aAgBblc76EUTW/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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