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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4910e905522ae706fc4c9d2e7b0a100e24db275a8626c2aa55e6810426aa3847' 
  AND token = '6D9VLeSZfomtMuTs/y2H13/E4BZwLtjWT9Wzmt3faKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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