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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf88705ce7fd43b2d7f490c0acd598281d75d62bddecf1ebc447244b0cd5173' 
  AND token = '/R8rDMenSHVi3oEENnwg44EP/9+DM1EWTfI4+s0a5uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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