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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885dd59c09346925a5ce56465feda8f1c4ec3f1b8aa6712dba28af2dadd8e136' 
  AND token = '/I96nvWbbs+Gx2CaiLeq9wl7l6iPFgkNWmtwOXvlqLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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