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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b123360505b43a399ca834816c6ffb412e66696397cfe54250233850cbedcb' 
  AND token = 'Jk4e9xGWkZigEry7KiZwPvJfN1F9zgH2D9iPDeqJZGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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