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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62765de347dcdc078f43249b646a5cf3c5940f5e3948fc0be4579d54420b3327' 
  AND token = 'duyeVk9P+oaqnD9yMTMDqCu33Rmjw83k+QLYsDa54b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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