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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b610725f9c8aaac6a05829e188f8fe1c06ed1513d4bccb3da7374c2b3f1c9485' 
  AND token = '+MMChKuQ0bema5f+GEkoZucKvoIp5pg10Q6of4Bu8H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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