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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d4b246291f5131bc78436aba4b4aa815a7bd3e29bb70925e50cf22aafc0c4b5' 
  AND token = '+D0ugQgLYFO8X3FCXmEo+whH+AccXiv2TreaoLAQNT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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