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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70dd8604ff55914ba6bc344070d4eaba1f7ddbd72bcbb320397296e574dd72a9' 
  AND token = 'NST5nVelaxEiVzjubETVFrtmAt+yu5I+qruXLeRoS+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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